Linux, Invoking Crontab with various options

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About Crontab Options

The crontab command has several options as follows:

Option
Purpose

-e
edit the current crontab file using the text editor specified by the EDITOR environment variable or the VISUAL environment variable

-l
list the current crontab file

-r
remove the current crontab file

-u
specifys the user’s crontab to be manipulated. This is usually used by root to manipulate the crontab of other users or can be used by you to correctly identify the crontab to be manipulated if you have used the su command to assume another identity.

Crontab also accepts a file name and will use the specified file to create the crontab file. Many prefer to use this option rather than editing the crontab because it provides a master file from which the crontab is built thus providing a backup to the crontab. The following example specifies a file called mycron.tab to be used as the input for crontab.

Creating Crontab from a master file

$ crontab mycron.tab

$

The following examples invoke crontab with some of the options listed earlier.

Invoking crontab with various options

$ crontab -l

# Use the Korn Shell for all shell scripts

SHELL=/bin/ksh

#**********************************************************

# Run the Weekly file cleanup task at 6:00AM every Monday

# and send any output to a file called cleanup.lst in the

# /tmp directory

#**********************************************************

00 06 * * 1 /home/terry/cleanup.ksh > /tmp/cleanup.lst

#**********************************************************

# Run the Weekly Management Report every Monday at 7:00 AM

# and save a copy of the report in my /home directory

#**********************************************************

00 07 * * 1 /home/terry/weekly_mgmt_rpt.ksh wprd > /home/terry/weekly_mgmt_rpt.lst

$

$ crontab -r

$

The above book excerpt is from:

Easy Linux Commands
Working Examples of Linux Command Syntax

ISBN: 0-9759135-0-6

Terry Clark

http://www.rampant-books.com/book_2005_1_linux_commands.htm

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